Science final test Flashcards
Elements
A unique particle of matter or a fundamental building block
Constraint
A limitation on the range of possible solutions
Pure lithium
Fizzes when exploded to water
Pure sodium
React violently enough to create a fire with mixed water
Pure potassium
Explodes when wet. Using method of measurement called daltons
Air it made out of
nitrogen and oxygen particles
Criteria
requirements that must be met for an engineering to be successful
Chemical bond
connection between atoms in more complex particles
Molecule
a group of two of more atoms that held together be chemical bond and the have unique structure and composition
Model
A representation of an object that aspects easier to see atomic composition
Crystal
a solid structure atoms of molecules are reaping three dimensional pattern
Polymer
a type of extended structure that made of smaller repeating subunit a in a chain
Substances
is a matter has constant chemical composition and characteristics
When enough molecules come together
they create a substance
Mixture
is made of different types of atoms or elements or molecules that are not chemically combined
Compound
substance that is made of two or more elements that are chemically bonded smallest unit of compound are atoms
Mixtures do not have
chemical same composition and a lot of varied substances in varying amount
Density
mass per unit volume
Melting point
temperature that substance melts or boils
Solubility
describes how well a substance dissolves in another substance (used to identify the substance)
Flammability
describes how well can substances burn
Melting point changes from
solid to liquid to gas (does not change the amount u have)
How to find volume
density divide mass divide volume
solid
atoms or molecules are closely packed together and touching. Unable to move other than vibrating in place